@PC20 try to think about what you need to do to get where you need to be.
Try to forget the normal rules.
How old are the kids? My youngest is 6 and I have only just got rid of all her baby things. I have one pram.and car seat to dump, that's it.
So, some people keep two outfits? Who dictates that rule? No one. Get yourself one or two of those 20l plastic boxes for example. That's how much you can keep. Why not if it means you can then see a few bin bags worth go? You might then be able to go back and thin those boxes again one day but as long as some things go?
I sold some things on Ebay. I made 1k! After that it was easier to give lots away. I became desensitized to the uncomfortable feeling of letting go.
Or say you must get rid of 1 thing a day or 2 things before you get one new.
Each item think, will I use this again? Do I need it? Can I replace it? Can I live without it? Maybe you cant live without it today, that's ok. But somethings will pass that test out of the door.
Be kind to yourself. But know you deserve your house back. The gold standard I aim for is everything away. If that means there is two 20L boxes of baby grows in my loft that's ok. As long as I can access the loft, and it's safe. That's about the best I can do right now.
I had a professional organiser privately and she mostly just sat and talked to me. She let me sound off and redirected my mind to the here and now. Do you have anyone who could do that?
It's really good that you can see you have the emotional attachments creeping in. But if you can keep those treasures clean tidy and sorted they will give you more joy and comfort than in a bottomless pile.
Another thing, how do you feel when you get out the baby things? Do you really make you feel happy? Or sad at the kids growing up fast? I think I went through some of ds1 clothes when I was expecting his brother and they actually made me really sad. That's when I clam up and think "not today thank you!" The box in the loft never gets opened. But i know it's there.
Test yourself. Put some of the tatty bits into a clothing bin and i bet you will cope better than you think. Good luck